Plants — T
- Tabebuia Trumpet-Tree
- Tabernaemontana divaricata Adam's-apple
- Tabernaemontana undulata
- Tacca chantrieri Black bat flower
- Tadehagi godefroyanum
- Tagetes Marigold
- Tagetes erecta African Marigold
- Tamarindus indica Indian tamarind
- Tamarix gallica
- Tanacetum Tansies
- Tanacetum balsamita Costmary
- Tanacetum coccineum Garden Pyrethrum
- Tanacetum microphyllum
- Tanacetum parthenium Feverfew
- Tanacetum vulgare Tansy
- Taraxacum Dandelion
- Taraxacum coreanum White-flowering Korean dandelion
- Taraxacum officinale common dandelion
- Taraxacum sinicum Altai dandelion
- Tarenna hoaensis
- Tarlmounia
- Taxaceae
- Taxillus chinensis Mulberry Mistletoe
- Taxus baccata Canada Yew
- Taxus brevifolia Canadian Yew
- Taxus chinensis
- Taxus cuspidata Japanese Yew
- Taxus ×media Anglo-Japanese yew
- Taxus sumatrana
- Taxus wallichiana East Himalayan Yew
- Tecoma stans Ginger Thomas
- Tephroseris kirilowii East Asian groundsel
- Terminalia Terminalia (plant)
- Terminalia arjuna Arjun tree
- Terminalia bellirica Bastard Myrobalan
- Terminalia chebula
- Terminalia citrina black chuglam
- Terminalia elliptica
- Tetracera indica Sandpaper Vine
- Tetracera loureiri
- Tetradium ruticarpum evodia
- Tetraneuris ivesiana Bitterweed
- Teucrium Germander
- Teucrium chamaedrys
- Teucrium cubense coastal germander
- Teucrium polium Felty Germander
- Teucrium scorodonia
- Thalictrum alpinum Alpine Meadow-rue
- Thalictrum flavum Common Meadow-Rue
- Thalictrum foetidum Foetid Meadow-rue
- Thalictrum minus Lesser Meadow-Rue
- Thalictrum petaloideum Petaloid meadow-rue
- Thalictrum simplex
- Thapsia Thapsia (plant)
- Thapsia villosa villous deadly carrot
- Thaumatococcus daniellii miracle fruit
- Thaumatophyllum
- Theobroma cacao cacao
- Thermopsis
- Thermopsis lanceolata lanceleaf thermopsis
- Thermopsis montana
- Thespesia populnea
- Thonningia
- Thonningia sanguinea Ground Pineapple
- Thuja Arborvitae
- Thuja occidentalis American Arbor-Vitae
- Thuja plicata Canoe Cedar
- Thunbergia laurifolia Blue Trumpet Vine
- Thymbra spicata Thyme Spike
- Thymus
- Thymus markhotensis Markhotian Thyme
- Thymus pseudolanuginosus woolly thyme
- Thymus serpyllum Breckland Garden
- Thymus vulgaris Common Thyme
- Thyrsanthera suborbicularis
- Thysanolaena maxima Amliso
- Tilia Basswood
- Tiliacora triandra
- Tilia cordata Linden
- Tinospora baenzigeri
- Tinospora cordifolia
- Tinospora sagittata
- Tithonia diversifolia Japanese-sunflower
- Torilis japonica Erect Hedgeparsley
- Torreya nucifera Japanese Nutmeg Tree
- Toxicodendron radicans Eastern Poison Ivy
- Toxicodendron vernicifluum Chinese Lacquer
- Trachelospermum jasminoides Chinese star-jessamine
- Trachyspermum ammi Ajowan
- Tradescantia pallida "Wandering Jew"
- Tradescantia spathacea Boatlily
- Tradescantia zebrina Inch-plant
- Treculia africana
- Trema orientale Elm
- Triadica sebifera Chinese tallow
- Tribulus terrestris Annual Devilthorn
- Trichilia Mahoganies
- Trichopus zeylanicus
- Trichosanthes Snake Gourds
- Trichosanthes costata
- Trichosanthes kirilowii Chinese cucumber
- Trichosanthes tricuspidata Red-ball Snake Gourd
- Triclisia
- Trifolium alpestre Owl-Head Clover
- Trifolium aureum Golden Clover
- Trifolium lupinaster Lupine clover
- Trifolium montanum mountain clover
- Trifolium pratense Chilean Clover
- Trifolium repens Dutch Clover
- Trigonella foenum-graecum Fenugreek
- Trigonostemon
- Trigonotis peduncularis Common Asian trigonotis
- Trillium camschatcense Kamchatka Trillium
- Tripterygium regelii Regel’s threewingnut
- Tripterygium wilfordii Thunder God Vine
- Triticum aestivum
- Trollius altaicus Altai Globeflower
- Trollius asiaticus Asian globeflower
- Trollius kytmanovii
- Tropaeolum Nasturtium
- Tropaeolum tuberosum anu
- Tulbaghia montana
- Turbinicarpus top cactus
- Turczaninowia fastigiata
- Turnera diffusa Mexican-holly
- Turnera hermannioides
- Turnera subulata Cuban Buttercup
- Turritis glabra
- Tussilago farfara Tussilago
- Typha angustifolia Cattail
- Typha domingensis Southern Cat-tail
- Typhonium venosum